Oil/Water/Solids separator & sand interceptor
Mercer offers integral and stand-alone 'sand interceptors' ahead of our standard oil/water separators. We incorporate sand interceptors where heavy solids are known to be in the wastewater and need an area for coarse removal before entering the coalescer compartment. By taking out the heavy solids, there is less loading on the coalescer, thereby allowing the coalescer to supply optimal results. A sand interceptor tank is also used when there is very heavy oils as well. This tank acts as a primary tank for removal of large micron droplet sized oil. In this case as well, the interceptor tank will take the gross oil out of the wastewater upstream of the coalescer, preventing the coalescer from being 'choked' by excessive oil.
Mercer supplies sand interceptors for New Jersey Transit in ground separator systems for use in their bus wash facilities (see photo). The sand interceptors are used to catch the majority of solids before they ever enter the separator. This is a great strategy for reducing the frequency of maintenance required for the oil/water separator. By removing solids in a relatively large interceptor tank, they are never introduced into the coalescer--greatly reducing the potential for solids accumulation in the coalescer. This can cut the frequency of required maintenance in half.